A brazed diamond bit for preventing the falling of a pregnant insert block

Abstract

This invention discloses a welded diamond drill bit designed to prevent the impregnated matrix blocks from falling off, relating to the field of core drilling bits for well drilling engineering. It includes a drill bit body and several impregnated matrix blocks, which are positioned at one end of the drill bit body. These blocks slide radially into the drill bit body and are fixedly connected to it. An axial limiting structure prevents the impregnated matrix blocks from falling off along the axial direction of the drill bit body. A filling space is provided between the drill bit body and the impregnated matrix blocks for filling with solder and ensuring sufficient heating during welding. A through hole is provided on each impregnated matrix block, communicating with the filling space. This invention prevents the impregnated matrix blocks from falling off entirely, solves the problems of uneven heating and insufficient solder filling during welding of the impregnated matrix blocks to the drill bit body, improves the welding strength of the impregnated matrix blocks, and thus enhances the reliability of the welded impregnated diamond drill bit.

Description

Technical Field

[0001] This invention relates to the field of core drilling bit technology in drilling engineering, and in particular to a welded diamond drill bit for preventing the impregnated matrix from falling off. Background Technology

[0002] Core drilling is a drilling method and process that uses core drilling tools to obtain formation core data, and it is an important component of drilling engineering. Core drilling is a crucial technical means in geological exploration, oil and gas well reservoir evaluation, geothermal drilling, and scientific drilling. The performance of core drilling tools, especially drill bits, is key to successful core drilling; the quality of the drill bit directly affects the efficiency and quality of core drilling.

[0003] Currently, the manufacturing technology for small-diameter impregnated hot-pressed diamond drill bits is very mature. Formed through integral hot pressing and sintering, it offers good economic efficiency and practicality. However, for large-diameter impregnated hot-pressed diamond drill bits, integral sintering has many drawbacks. For example, the diamond powder, due to its large surface area, may not be sufficiently heated and compressed during the hot pressing process, resulting in insufficient strength of the drill bit matrix. A commonly used method for manufacturing large-diameter impregnated diamond core drill bits is to hot-press and sinter the matrix into a block, which is then welded to the drill bit body. While the individual blocks of the welded impregnated diamond core drill bit have good performance and strength, the welding process between the block and the drill bit body means that when encountering obstacles during reaming or drilling into fractured formations, the blocks may break off due to uneven stress, causing premature damage or scrapping of the drill bit. Summary of the Invention

[0004] The purpose of this invention is to provide a welded diamond drill bit that prevents the impregnated matrix from falling off. This invention can prevent the impregnated matrix from falling off as a whole, and can solve the problems of uneven heating and insufficient solder filling during the welding process between the impregnated matrix and the drill bit body. This improves the welding strength of the impregnated matrix and further prevents the impregnated matrix from falling off.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a welded diamond drill bit for preventing the impregnated matrix from falling off, comprising a drill bit body and a plurality of impregnated matrix blocks. The plurality of impregnated matrix blocks are disposed at one end of the drill bit body. After sliding radially into the drill bit body, the plurality of impregnated matrix blocks are fixedly connected to the drill bit body. The impregnated matrix blocks and the drill bit body are prevented from falling off along the axial direction of the drill bit body by means of an axial limiting structure. A filling space for filling solder and sufficient heating during welding is provided between the drill bit body and the impregnated matrix blocks. A through hole is provided on the impregnated matrix block, and the through hole communicates with the filling space.

[0007] Preferably, the impregnated pads are uniformly arranged along the circumference of the drill bit body.

[0008] Preferably, the drill bit body has a plurality of grooves, and the impregnated block has a slider that can slide into the groove. The size of the groove gradually decreases from the outer end to the inner end of the groove, and the size of the slider gradually decreases from the outer end to the inner end of the slider. The taper of the groove is the same as the taper of the slider.

[0009] Preferably, the outer end of the groove has the same dimensions as the outer end of the slider.

[0010] Preferably, the space between the bottom surface of the slider and the groove is used to fill solder.

[0011] Preferably, the axial limiting structure includes a protrusion disposed on the side wall of the groove and a groove disposed on the side of the impregnated block, the groove matching the protrusion, and the extension direction of the protrusion being perpendicular to the axial direction of the drill bit body.

[0012] Preferably, the through hole extends through the impregnated matrix, and the axial direction of the through hole is parallel to the axial direction of the drill bit body.

[0013] The present invention achieves the following technical effects compared to the prior art:

[0014] This invention, through its axial limiting structure, prevents the entire impregnated matrix from falling off when encountering complex drilling conditions that cause the welded impregnated matrix to loosen. This reduces the obstruction and damage to the drill bit caused by a fallen impregnated matrix. On the other hand, by creating a through hole in the impregnated matrix, the filler metal in the weld seam is more uniform, and the heating during welding is more thorough, improving the weld strength. This, in turn, enhances the overall strength and reliability of the impregnated hot-pressed diamond drill bit, ensuring the safety and efficiency of core drilling. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a side view of the inlaid diamond drill bit of the present invention for preventing the inlaid pad from falling off;

[0017] Figure 2 for Figure 1 AA section view;

[0018] Figure 3 This is a schematic diagram of the rigid body of the drill bit of the present invention;

[0019] Figure 4 for Figure 1 BB section view;

[0020] Figure 5 This is an isometric view of the inlaid pad of the present invention;

[0021] Figure 6 This is a side view of the implanted pad of the present invention;

[0022] Wherein: 1: Drill bit rigid body, 2: Inlaid pad, 1-1: Slide groove, 1-2: Protrusion, 2-1: Through hole, 2-2: Groove, 2-3: Slider. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide a welded diamond drill bit that prevents the impregnated matrix from falling off. This invention can prevent the impregnated matrix from falling off as a whole, and can solve the problems of uneven heating and insufficient solder filling during the welding process between the impregnated matrix and the drill bit body. This improves the welding strength of the impregnated matrix and further prevents the impregnated matrix from falling off.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 6As shown: This embodiment provides a welded diamond drill bit to prevent the impregnated matrix blocks from falling off. It includes a drill bit body 1 and several impregnated matrix blocks 2. The several impregnated matrix blocks 2 are evenly arranged circumferentially at one end of the drill bit body 1. After sliding radially into the drill bit body 1, the several impregnated matrix blocks 2 are fixedly connected to the drill bit body 1 by welding. An axial limiting structure prevents the impregnated matrix blocks 2 from falling off along the axial direction of the drill bit body 1. A filling space is provided between the drill bit body 1 and the impregnated matrix blocks 2 for filling with solder and for sufficient heating during welding. A through hole 2-1 is provided on the impregnated matrix block 2, communicating with the filling space. The drill bit body 1 and the several impregnated matrix blocks 2 are connected by welding. When the impregnated jig 2 becomes loose, this embodiment uses an axial limiting structure to axially limit the impregnated jig 2 and a well wall to radially limit the impregnated jig 2. Furthermore, it can fill the gap between the drill bit body 1 and the impregnated jig 2 through the through hole 2-1 and heat it, so that the solder radiates and fills the gap in all directions, further improving the welding strength of the impregnated jig 2 on the drill bit body 1 and further strengthening the overall strength of the drill bit.

[0027] Specifically, in this embodiment, the drill bit rigid body 1 is provided with several sliding grooves 1-1, which are arranged radially along the drill bit rigid body 1. The impregnated die block 2 is provided with a slider 2-3, which can slide into the sliding groove 1-1. The bottom surface of the slider 2-3 and the bottom surface of the sliding groove 1-1 are used to fill the space between them with solder. The size of the sliding groove 1-1 gradually decreases from the outer end to the inner end of the sliding groove 1-1. The size of the slider 2-3 gradually decreases from the outer end to the inner end of the slider 2-3. The size of the outer end of the sliding groove 1-1 is the same as the size of the outer end of the slider 2-3, and the taper of the sliding groove 1-1 is the same as the taper of the slider 2-3. After the impregnated block 2 enters the drill bit rigid body 1 from the outside, the slider 2-3 slides along the length of the groove 1-1. When the impregnated block 2 is in contact with the drill bit rigid body 1, the impregnated block 2 cannot continue to slide inward, thus limiting the inner end of the impregnated block 2. The outer end of the impregnated block 2 is limited by the well wall.

[0028] In this embodiment, the axial limiting structure includes a protrusion 1-2 disposed on the side wall of the slide groove 1-1 and a groove 2-2 disposed on the side of the impregnated block 2. The groove 2-2 matches the protrusion 1-2, and the extending direction of the protrusion 1-2 is perpendicular to the axial direction of the drill bit body 1. After the impregnated block 2 enters the drill bit body 1 from the outside, it slides radially along the drill bit body 1, and the protrusion 1-2 is located in the groove 2-2, thereby achieving axial limiting of the impregnated block 2.

[0029] In this embodiment, the through hole 2-1 is set through the impregnated pad 2, and the axis of the through hole 2-1 is parallel to the axis of the drill bit body 1.

[0030] In this embodiment, the protrusion 1-2 of the drill bit rigid body 1 cooperates with the groove 2-2 of the impregnated block 2 to axially limit the impregnated block 2. The outer end of the impregnated block 2 is limited by the well wall, and the inner end of the impregnated block 2 is limited by the taper of the slide groove 1-1. Therefore, after the welding between the bottom surface of the slide groove 1-1 and the bottom surface of the slider 2-3 becomes loose, the impregnated block 2 cannot move due to the axial and radial limitations, preventing the impregnated block 2 from falling off as a whole, and the impregnated block 2 can continue to work normally. During welding, the uneven heating of the center part of the bottom surface of the slide groove 1-1 and the bottom surface of the slider 2-3 leads to insufficient filling of the solder. Solder is added to the filling space through the through hole 2-1 and heated, so that the solder radiates and fills the surrounding area of ​​the inner end of the through hole 2-1, further strengthening the welding strength between the bottom surface of the slide groove 1-1 and the bottom surface of the slider 2-3, and improving the welding strength of the drill bit impregnated block 2.

[0031] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A type of welded diamond drill bit for preventing the falling off of the impregnated matrix, characterized in that: The device includes a drill bit body and several impregnated blocks. The impregnated blocks are disposed at one end of the drill bit body. After sliding into the drill bit body radially, the impregnated blocks are fixedly connected to the drill bit body. The impregnated blocks and the drill bit body are prevented from falling off along the axial direction of the drill bit body by an axial limiting structure. A filling space for filling solder and fully heating during welding is provided between the drill bit body and the impregnated blocks. A through hole is provided on the impregnated blocks, and the through hole communicates with the filling space. The drill bit body has several grooves, and the impregnated block has a slider that can slide into the groove. The size of the groove gradually decreases from the outer end to the inner end of the groove, and the size of the slider gradually decreases from the outer end to the inner end of the slider. The taper of the groove is the same as the taper of the slider. The axial limiting structure includes a protrusion on the side wall of the slide and a groove on the side of the impregnated block. The groove matches the protrusion, and the extension direction of the protrusion is perpendicular to the axial direction of the drill bit body.

2. The inlaid diamond drill bit for preventing the impregnated matrix from falling off according to claim 1, characterized in that: The impregnated pads are evenly distributed along the circumference of the drill bit body.

3. The inlaid diamond drill bit for preventing the impregnated matrix from falling off according to claim 1, characterized in that: The outer end of the groove has the same dimensions as the outer end of the slider.

4. The inlaid diamond drill bit for preventing the impregnated matrix from falling off according to claim 1, characterized in that: The space between the bottom surface of the slider and the groove is used to fill solder.

5. The inlaid diamond drill bit for preventing the impregnated matrix from falling off according to claim 1, characterized in that: The through hole extends through the impregnated block, and the axis of the through hole is parallel to the axis of the drill bit body.

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